Some arcade games used additional storage for uncompressed audio, referred to as "samples". These files go in the SAMPLES folder and are automatically used when the corresponding game is launched. Samples can be specific to a single game or applicable to multiple versions of the game.
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CHD files should not be thrown loose into your main ROMs directory. Create a subfolder named exactly after the game's short name (e.g., roms/kinst/ ) and place the kinst.chd file inside it. Some arcade games used additional storage for uncompressed